There is not much info on this hike on the internet which was frustrating when I was researching, so I figured I would give some specifics.
We hiked from the trailhead to the waterfall. I used GPS, a Fitbit, a mileage watch and an altimeter to log in distances and elevation gain.
2 miles and approximately 700 vertical feet from the trailhead, you will reach the log jam. The next 1/2 mile has virtually no elevation gain. At 2.54 miles you reach the Selway-Bitterroot Wilderness boundary sign.
At 2.95 miles you will reach a fork in the trail. Take the fork to the right(if go straight you will have to cross the stream) to view the waterfall. You will hear the waterfall after another 1/4 mile. It is viewed on the right, at an elevation of roughly 4,800 feet.
Total elevation gain to the waterfall is about 900 feet-a very easy hike spread out over 3.3 miles. You can continue on the trail which connects with the other fork(4.5 miles) eventually on its way to Bass Lake.
From the waterfall, it is another 4.7 miles to Bass Lake, with another 2,250 of altitude gain. The lake sits at an altitude of 7,050. If going in the winter, you will need snowshoes once you pass the waterfall, if not sooner.
The hike to the waterfall will take you about 90 minutes. The views are amazing with the waterfall on your right, and Sawtooth Peak toward your left.